tools: add Release and Debug symlinks to .gitignore

Seems at least some windows versions interpret symlinks not as folders
therefore .gitignore needs some extra entries.

PR-URL: #27484
Refs: #27149
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

.gitignore

@@ -42,8 +42,8 @@ coverage/
 /out
 
 # various stuff that VC++ produces/uses and is not in /out
-/Debug/
-/Release/
+/Debug
+/Release
 !doc/blog/**
 *.sln
 !nodemsi.sln